add pypy and python 3.6 to package classifiers

Author: tony

setup.py

@@ -66,6 +66,8 @@ def run_tests(self):
         'Programming Language :: Python :: 3.3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: Implementation :: PyPy',
         "Topic :: Utilities",
         "Topic :: System :: Shells",
     ],